 /* 导航菜单样式 */
.nav-menu {
    margin-bottom: 20px;
    background-color: #ffffff;
    padding: 15px;
    border-radius: 4px;
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    border: 1px solid #000000;
}

.nav-menu a {
    margin-right: 15px;
    text-decoration: none;
    color: #000000;
    padding: 8px 12px;
    border-radius: 4px;
    transition: all 0.3s ease-in-out;
}

.nav-menu a:hover {
    background-color: #ffffff;
    text-decoration: none;
}